US20180212719A1 - Tcp enhancements in reduced radio link quality conditions - Google Patents

Tcp enhancements in reduced radio link quality conditions Download PDF

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Publication number
US20180212719A1
US20180212719A1 US15/878,111 US201815878111A US2018212719A1 US 20180212719 A1 US20180212719 A1 US 20180212719A1 US 201815878111 A US201815878111 A US 201815878111A US 2018212719 A1 US2018212719 A1 US 2018212719A1
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tcp
radio
tcp ack
ack
sequence number
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Yu-Syuan Jheng
Yuan-Wen Ting
Pei-Shan KAO
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MediaTek Inc
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MediaTek Inc
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Priority to US15/878,111 priority Critical patent/US20180212719A1/en
Priority to PCT/CN2018/073993 priority patent/WO2018137656A1/en
Priority to CN201880003457.4A priority patent/CN109691040A/zh
Priority to EP18744085.4A priority patent/EP3571816A4/en
Publication of US20180212719A1 publication Critical patent/US20180212719A1/en
Priority to TW107146290A priority patent/TW201933933A/zh
Assigned to MEDIATEK INC. reassignment MEDIATEK INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JHENG, YU-SYUAN, KAO, PEI-SHAN, TING, YUAN-WEN
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0273—Traffic management, e.g. flow control or congestion control adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/391—Modelling the propagation channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1628—List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H04W36/085—Reselecting an access point involving beams of access points
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1621—Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/12—Avoiding congestion; Recovering from congestion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00692—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1443—Reselecting a network or an air interface over a different radio air interface technology between licensed networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Millimeter wave radio communications (corresponding to radio frequencies above roughly 10 GHz) afford substantially higher data capacity than their longer wavelength counterparts. Consequently, communications at such frequencies are one of the central enhancements being adopted in the 3 rd generation partnership project (3GPP) standards for the next generation, so-called 5G, mobile telecommunication networks. While 5G will provide data rates in the 10 Mbit/s-1 Gbit/s range, shorter wavelength radio communications suffer high variability in radio link quality. Indeed, buildings, automobiles and even the human body can interfere with millimeter wave radio, thus diminishing the quality of the affected radio links.
  • 3GPP 3 rd generation partnership project
  • FIG. 9 depicts a blocker 10 being interposed between user equipment (UE) 110 (also referred to as a wireless transmit and receive unit (WTRU)) and a transmitter (not illustrated).
  • UE user equipment
  • WTRU wireless transmit and receive unit
  • blocker 10 has a dimension W that is transverse to the directionality of the UE antenna, is located a distance D from UE 20 and is moving at velocity V.
  • Table 30 illustrates radio link outage intervals for different types of blockers 10 , where items 32 may correspond to a large truck, items 34 may correspond to a passenger automobile and item 36 may correspond to a human body. As FIG. 9 demonstrates, considerable radio link outage may occur in the presence of these blockers.
  • FIG. 10 illustrates another blockage scenario in which passenger automobiles 12 a - 12 d , representatively referred to herein as automobile(s) 12 , are moving at a velocity V and maintaining a distance D_safe between one automobile 12 to the next.
  • the blockage is intermittent, with the time between successive blockage events being illustrated in Table 40.
  • FIG. 11 illustrates the effect on data rate 50 and TCP sender window size (MSS per the Transport Control Protocol (TCP)) 60 responsive to blockage at blocking intervals 55 a - 55 e , representatively referred to herein as blocking interval(s) 55 .
  • MSS per the Transport Control Protocol (TCP) TCP sender window size
  • TCP sender retransmission timeout RTO
  • congestion control mechanisms was triggered such as window shrinking.
  • Performance in a communications system is improved by determining whether an application executing over a data bearer is using transmission control protocol (TCP).
  • TCP transmission control protocol
  • a TCP ACK reduction request is received and at least one redundant TCP ACK is filtered out.
  • FIG. 1 is a schematic block diagram of an example system in which the present general inventive concept can be embodied.
  • FIG. 2 is a schematic block diagram of an example dual connectivity mode in which embodiments of the present general inventive concept can be configured.
  • FIG. 3 is a block diagram of example logic flow in accordance with which the present general inventive concept can be embodied.
  • FIG. 4 is a flow diagram of an example blockage detection process by which the present general inventive concept can be embodied.
  • FIGS. 5A-5B are graphs representing different blockage indications that can be used in conjunction with embodiments of the present general inventive concept.
  • FIG. 6 is a flow diagram of an example uplink bearer switching process by which the present general inventive concept can be embodied.
  • FIG. 7 is a flow diagram of an example downlink bearer switching process by which the present general inventive concept can be embodied.
  • FIG. 8 is a flow diagram of an example TCP enhancement process by which the present general inventive concept can be embodied.
  • FIG. 9 is a diagram of a millimeter wave radio blockage scenario.
  • FIG. 10 is a diagram of another millimeter wave radio blockage scenario.
  • FIG. 11 is a set of graphs illustrating the impact of millimeter wave radio blockage on TCP throughput.
  • exemplary is used herein to mean, “serving as an example, instance or illustration.” Any embodiment of construction, process, design, technique, etc., designated herein as exemplary is not necessarily to be construed as preferred or advantageous over other such embodiments. Particular quality or fitness of the examples indicated herein as exemplary is neither intended nor should be inferred.
  • Embodiments of the invention ameliorate deteriorative effects on connection-oriented application layer data transport, such as the transmission control protocol (TCP), in the presence radio signal blockage.
  • TCP transmission control protocol
  • NR next generation or “new” radio
  • LTE long term evolution
  • E-UTRA legacy LTE evolved universal mobile telecommunications system
  • 4G 4G
  • 5G will refer to implementations that include NR operating at millimeter wavelengths.
  • FIG. 1 is a schematic block diagram of an example system 100 by which the present invention can be embodied.
  • UE 110 may be a wireless transmit and receive unit (WTRU) comprising radio circuitry 110 a , processor circuitry 110 b and memory circuitry 110 c .
  • WTRU wireless transmit and receive unit
  • UE 110 may be constructed or otherwise configured to communicate with an LTE evolved Node B (eNB) and with a 5G next generation node B (gNB) comprising radio circuitry 120 a and 130 a , respectively, processor circuitry 120 b and 130 b , respectively and memory circuitry 120 c and 130 c , respectively.
  • UE 110 may be communicatively coupled to eNB 120 over a signaling link 152 and to a gNB 130 over a signaling link 154 .
  • ENB 120 and gNB 130 may be communicatively coupled to a core network, such as the LTE evolved packet core (EPC) 140 , over signaling links 156 and 158 , respectively. Additionally, eNB 120 and gNB 130 may be communicatively coupled to each other over suitable signaling link 155 .
  • EPC LTE evolved packet core
  • signaling links 152 , 154 , 155 , 156 and 158 may carry either or both control plane data and user plane data, depending on the connected entities.
  • environment 100 represents a 5G non-standalone (NSA) architecture implementation.
  • Radio circuitry 120 a and 130 a may be constructed or otherwise configured to realize radio protocol stacks 125 and 135 , respectively.
  • Each radio stack 125 and 135 may realize, among others, a radio resource control (RRC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer and a physical (PHY) layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • PHY physical
  • Radio circuitry 110 a may be constructed or otherwise configured to realize radio protocol stacks 115 a and 115 b , each comprising an RRC layer, a PDCP layer, an RLC layer, a MAC layer and a PHY layer.
  • Radio protocol stacks 115 a and 115 b are constructed or otherwise configured for each radio access technology utilized in eNB 120 and gNB 130 , e.g., LTE and NR, respectively.
  • FIG. 2 illustrates a dual connectivity configuration 200 that may be used in conjunction with embodiments of the present invention.
  • dual connectivity configuration 200 5G NR PDCP entities may be communicatively coupled to LTE E-UTRA RLC entities. While such coupling takes place onboard UE 110 , the communication between eNB 120 , serving as master node MN, and gNB 130 , serving as secondary node SN, may proceed over the X2 interface.
  • Dual connectivity configuration 200 allows UE 110 to simultaneously transmit and receive data on multiple component carriers from two cell groups via master node MN and secondary node SN. This is a distinction from carrier aggregation (CA) which allows UE 110 to simultaneously transmit and receive data on multiple component carriers from a single base node.
  • CA traffic is split in the MAC layer
  • E-UTRAN dual connectivity (EN-DC) is split in the PDCP layer.
  • UE 110 is configured to convey data over alternate links, either through two separate PDCP entities corresponding to individual bearers or a single PDCP entity corresponding to a split bearer.
  • traffic is transported over a first bearer between UE 110 and, for example, gNB 130 until the link quality meets some unacceptability criterion, such as an indication of blockage. Responsive to the link quality meeting the unacceptability criterion, traffic may be transferred to an alternative bearer between UE 110 and, for example, eNB 120 .
  • FIG. 3 is a flow diagram of an exemplary embodiment of the present invention comprising blockage detection logic 310 , by which diminished radio link quality situations are identified, bearer switching logic 320 , by which radio link quality issues are mitigated and TCP enhancement logic 330 , by which TCP operation is restored once such radio link quality mitigation has occurred.
  • blockage detection logic 310 bearer switching logic 320 and TCP enhancement logic 330 are illustrated in FIG. 3 as contained in a composite flow, each of these components may be used alone in other contexts, as the skilled artisan will appreciate upon review of this disclosure.
  • FIG. 4 is an exemplary blockage detection process 400 that may be implemented by blockage detection logic 310 .
  • radio link characteristics of NR are monitored.
  • Blockage detection logic 310 may continuously perform radio link monitoring to determine when radio blockage is occurring. Such may be achieved by various mechanisms onboard UE 110 , e.g., conventional measurements configured by the RRC layer and radio link monitoring performed by the Physical layer.
  • UE 110 may monitor one of several different parameters of the radio link to determine whether blockage is occurring, including reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal to interference plus noise (SINR), block error rate (BLER) and channel quality indicator (CQI).
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • SINR signal to interference plus noise
  • BLER block error rate
  • CQI channel quality indicator
  • Such parameters may be compared with respective thresholds established by a user or network administrator.
  • blockage may be identified from increasing latency of acknowledgments of RLC PDUs, increasing queuing time in layer 2 buffer and degradation in successful delivery indication as HARQ ACK.
  • a serving beam and candidate beam are compared to a block error rate (BLER) threshold that determines whether each beam is in-sync or out-of-sync.
  • BLER block error rate
  • the BLER may be compared with a suitable threshold, e.g., LTE defines a threshold of 2% (Qin) on the PDCCH block error rate as in-sync and 10% (Qout) as out-of-sync.
  • FIG. 5B is another graph depicting how a beam may be identified as blocked.
  • historical data are maintained and whether a beam is blocked is determined by whether the quality of that beam has decreased by an amount determined from the historical data.
  • Various statistics may be derived from the historical data that can be used to establish an unacceptability criterion, such as a radio quality threshold.
  • Threshold 1 may be a difference between a current radio link measurement on a serving beam and a historical radio link measurement
  • Threshold 2 may be a difference between a current radio link measurement on a candidate beam and the historical radio link measurement.
  • a blockage report is a suitably formatted message that indicates to network entities that a blockage condition (such as determined per the unacceptability criterion described above) exists.
  • a blockage condition such as determined per the unacceptability criterion described above
  • Such message may contain information relevant to radio resource management, such as measurement result and beam information.
  • the radio resource manager may utilize the information to take some action, e.g., select a different beam or assert another scheduling policy.
  • a blockage report may not be necessary, in which case the sending of the report can be omitted.
  • embodiments of the invention may format and convey a blockage report indicating such to the network in operation 425 .
  • the blockage report can be sent via a newly active uplink, such as described below.
  • embodiments of the invention may perform bearer switching from an NR bearer to an LTE bearer.
  • Two modes of bearer switching are contemplated for embodiments of the invention: an autonomous mode in which the uplink is switched from NR to LTE without a prior report being sent and a network assisted mode in which the uplink is switched only after the network has approved the switch in response to a blockage or other report.
  • UE 110 may format and send an RRC measurement report to EPC 140 , in response to which EPC 140 may initiate an RRC connection reconfiguration procedure with UE 110 .
  • the autonomous switching mode UE 110 does not require an RRC message to command the switching, instead, the UE itself selects the UL transmission path among the two cell groups.
  • FIG. 6 is a flow diagram of an exemplary bearer switching process 600 that may be implemented by bearer switching logic 320 .
  • UE 110 determines of selects an active uplink cell group. For example, UE 110 may select NR link as active cell group with gNB 130 . Uplink traffic is conveyed over the active link in operation 610 , where the LTE radio is utilized as a backup radio in the event of blockage.
  • the associated radio circuitry can be placed in a reduced power mode.
  • process 600 may transition to operation 620 , by which transmissions between UE 110 and the active cell group are suspended.
  • operation 625 UE 110 switches to or otherwise selects an alternative cell group, e.g., eNB 120 . Once this has been achieved, radio link monitoring may continue in order to determine when the blocking condition (or other unacceptable condition) is lifted.
  • missing PDUs are restored.
  • the PDCP layer shall guarantee that data for which an acknowledgment has not been received is retransmitted.
  • UE 110 upon UE 110 switching the radio link, UE 110 shall ensure the data sent but unacknowledged in the previous link are retransmitted in the new link responsive to a request for such from EPC 140 .
  • a report may be formatted and conveyed so that missing blocks can be retransmitted over LTE. This may be achieved by a suitably formatted PDCP status report.
  • Certain embodiments implement a rapid recovery mechanism employed when it is determined that blockage has been lifted and system 100 is to recover. For example, when there are characteristics of blockage present, the original UL configuration is cached under a resumptive configuration ID for rapid re-establishment of NR operations once the blockage ceases. In certain embodiments, this may be achieved by requesting relevant information, e.g., cell ID, band configuration, etc., from the network via eNB 120 . Upon recovery, both the network and the UE 110 can recall its configuration from memory by the resumptive configuration ID. UE 110 may switch traffic to its NR in recovering from a previous switch according to the configuration data stored under the resumptive configuration ID.
  • relevant information e.g., cell ID, band configuration, etc.
  • FIG. 7 is a flow diagram of an example downlink bearer switching process 700 .
  • UE 110 receives its initial configuration to select a link in an active downlink cell group. For example, UE 110 may establish a link with gNB 130 .
  • operation 717 UE 110 switch the transmissions with the active cell group into reduced power mode.
  • UE 110 switches to or otherwise selects an alternate cell group, e.g., eNB 120 .
  • the alternate cell is awoken from its reduced power mode.
  • FIG. 8 is a flow diagram of an exemplary TCP enhancement process 800 that may be implemented in TCP enhancement logic 330 .
  • operation 805 it is determined whether TCP ACK reduction is required, such as to conserve radio resources. If so, process 800 may transition to operation 810 , by which TCP ACKs are filtered to remove those that can be omitted and replaced by a single ACK with the suitably encompassing sequence number. Additionally, as illustrated in FIG. 8 , embodiments of the invention may determine whether there is deterioration in TCP throughput, such as by monitoring flows in the active link. If so, process 800 may transition to operation 820 , whereby UE 110 may send an upstream DSACK to return the window to its original state.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
US15/878,111 2017-01-24 2018-01-23 Tcp enhancements in reduced radio link quality conditions Abandoned US20180212719A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US15/878,111 US20180212719A1 (en) 2017-01-24 2018-01-23 Tcp enhancements in reduced radio link quality conditions
PCT/CN2018/073993 WO2018137656A1 (en) 2017-01-24 2018-01-24 Tcp enhancements in reduced radio link quality conditions
CN201880003457.4A CN109691040A (zh) 2017-01-24 2018-01-24 无线电链路质量降低条件下的tcp改进
EP18744085.4A EP3571816A4 (en) 2017-01-24 2018-01-24 TCP IMPROVEMENTS UNDER REDUCED RADIO QUALITY CONDITIONS
TW107146290A TW201933933A (zh) 2017-01-24 2018-12-21 通訊系統中的tcp改進方法及使用者設備

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US201762449687P 2017-01-24 2017-01-24
US15/878,111 US20180212719A1 (en) 2017-01-24 2018-01-23 Tcp enhancements in reduced radio link quality conditions

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US15/878,115 Active US10623149B2 (en) 2017-01-24 2018-01-23 Blockage detection in millimeter wave radio communications
US15/878,111 Abandoned US20180212719A1 (en) 2017-01-24 2018-01-23 Tcp enhancements in reduced radio link quality conditions
US15/878,084 Active US10749639B2 (en) 2017-01-24 2018-01-23 Bearer switching in reduced radio link quality conditions
US16/811,931 Abandoned US20200220670A1 (en) 2017-01-24 2020-03-06 Blockage detection in millimeter wave radio communications

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US16/811,931 Abandoned US20200220670A1 (en) 2017-01-24 2020-03-06 Blockage detection in millimeter wave radio communications

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EP (3) EP3571816A4 (zh)
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